diff --git a/Makefile b/Makefile
index 79aaa7f1b2..e728e42b01 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ go_bin := "$$(go env GOPATH)/bin"
 gen_authopt_path := "$(go_bin)/protoc-gen-authoption"
 gen_zitadel_path := "$(go_bin)/protoc-gen-zitadel"
 
-now := $(shell date --rfc-3339=seconds | sed 's/ /T/')
+now := $(shell date '+%Y-%m-%dT%T%z' | sed -E 's/.([0-9]{2})([0-9]{2})$$/-\1:\2/')
 VERSION ?= development-$(now)
 COMMIT_SHA ?= $(shell git rev-parse HEAD)
 ZITADEL_IMAGE ?= zitadel:local